Immune System
Which of the following proteins would not need localization signal?

A protein bound to the endoplasmic reticulum (ER) membrane
A cell surface protein
A cytosolic protein
A nuclear protein

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Immune System
The role of the M cell is to

induce apoptosis in virus-infected small intestinal epithelia cells
they use their cilia to propel mucus out of the small intestine
trap virus in mucus and prevent entry
pass bacteria or virus to underlying macrophages for processing and presentation of antigen

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